The Crato Fossil Beds of Brazil: Spores and pollen from the Crato Formation: biostratigraphic and palaeoenvironmental implications
The Crato Fossil Beds of Brazil: Spores and pollen from the Crato Formation: biostratigraphic and palaeoenvironmental implications
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巴西克拉托化石床：来自克拉托地层的孢子和花粉：生物地层学和古环境影响
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
D. Batten
中科院分区：
文献类型：
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作者：
D. Batten
文献中记录了来自克拉托组和查帕达杜阿拉里皮其他稍老和稍新的地层的150多个孢子和花粉分类群，但大多缺乏关于地层产状和相对丰度的详细信息。因此，很难得出精确的生物地层学和古环境结论，也不可能根据这些植物微体化石的公开记录来认识到在演替过程中向上的气候和沉积条件的任何变化。通过排除的过程，它是合理的，建议的年龄范围晚阿普梯早期Albian的形成从数据。也可以推断，在这段时间里，它积累了大量的周围植被适应半干旱条件，虽然也一定有一些栖息地能够维持喜湿和水生植物。本章专门研究的两个样品的孢粉学成分强调了后者，这两个样品明确地来自克拉托组。恢复的组合也表明，形成更可能是晚Aptian比早Albian的年龄。此外，泥盆纪沉积物改造的证据也很明显。图20.1和图32显示了一些回收的孢子和花粉粒。
Well over 150 spore and pollen taxa have been recorded in the literature from the Crato Formation and other slightly older and younger formations in the Chapada do Araripe, but detailed information on stratigraphic occurrences and relative abundances is mostly lacking. As a result, it is difficult to draw precise biostratigraphic and palaeoenvironmental conclusions, and impossible to recognize any changes in climate and depositional conditions upwards through the succession on the basis of the published record of these plant microfossils. By a process of elimination it is reasonable to suggest an age range of late Aptian to early Albian for the formation from the data presented. It may also be inferred that during the time it accumulated much of the surrounding vegetation was adapted to semi-arid conditions, although there must also have been some habitats that were able to sustain moisture-loving and aquatic plants. The latter is emphasized by the palynological composition of two samples examined specifically for consideration in this chapter, which are unequivocally from the Crato Formation. The assemblages recovered also suggest that the formation is more likely to be late Aptian than early Albian in age. In addition, evidence of reworking of Devonian deposits is apparent. A few of the spores and pollen grains recovered are illustrated (Figure 20.1 and Plate 32).